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QRS Complex

Aka: QRS Complex, QRS Duration, Wide QRS, QRS Widening

See Also
1. R Wave
Normal findings: Duration
1. Limb leads (I, II, III): 0.05 to 0.10
2. Precordial leads (V1 to V6): 0.06 to 0.12
Causes: Wide QRS or Prolonged QRS Complex (over 0.12)
1. Abnormal interventricular conduction (e.g. Left Bundle Branch Block)
  1. See Bundle Branch Block
2. Medications (e.g. Toxin Ingestion or overdose)
  1. Results from sodium channel blockade
  2. Emergency management
    1. See Toxin Ingestion
    2. See Tricyclic Overdose
    3. Sodium Bicarbonate 1-2 amps IV push with repeat bolus until QRS narrows (adults)
  3. Causes
    1. Tricyclic Antidepressants
      1. Dry and sedated
    2. Cocaine
      1. Diaphoretic and agitated
    3. Diphenhydramine (Benadryl)
    4. Propoxyphene (not available in U.S.)
Causes: Low QRS amplitude (<5 mm in limb leads)
1. Diffuse Coronary Artery Disease
2. Congestive Heart Failure
3. Pericardial Effusion
4. Myxedema
5. Amyloidosis
6. Obesity
7. Emphysema (?OPD)
8. Anasarca
Causes: High QRS amplitude
1. Evaluate for Left Ventricular Hypertrophy

QRS complex duration (observable entity) (C0429025)
Concepts	Organism Attribute (T032)
SnomedCT	251208001
English	QRS complex duration (observable entity), QRS duration, QRS complex duration
Spanish	duración del complejo QRS (entidad observable), duración del complejo QRS
Sources	Derived from the NIH UMLS (Unified Medical Language System)

QRS complex feature (C0429097)
Definition (NCI)	QRS complex is a portion of the EKG tracing that represents depolarization of the ventricular myocardium. Normally the ventricles are activated simultaneously.
Concepts	Finding (T033)
SnomedCT	142119004, 164949005
Dutch	QRS-complex
French	Complexe QRS
German	QRS-Komplex
Italian	Complesso QRS
Portuguese	Complexo QRS
Spanish	Complejo QRS, QRS complex, característica del complejo QRS (entidad observable), característica del complejo QRS, complejo QRS (entidad observable), complejo QRS
Japanese	ＱＲＳ群, QRSｸﾞﾝ
English	QRS complex (observable entity), qrs complex, QRS complex, QRS complex feature (observable entity), QRS complex feature, EKG QRS Complex, QRS Complex
Czech	QRS komplex
Hungarian	QRS komplex
Sources	Derived from the NIH UMLS (Unified Medical Language System)

Family Practice Notebook

Patients should address specific medical concerns with their physicians.

Although access to this page is not restricted, the information found here is intended for use by medical providers.

This page was written by Scott Moses, MD, last revised on 3/1/2013 and last published on 5/14/2013.

This is one of 5887 pages in the Family Practice Notebook